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搜题/搜资源
【单选题】【消耗次数:1】
All the apples _____ fell down were eaten by the pigs.
①
those
②
which
③
what
④
that
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【判断题】
A fence separated the cows from the pigs.
①
正确
②
错误
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【单选题】
We looked for a table to sit down, but they were all ____.
①
reserved for
②
engaged in
③
used up
④
taken up
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【单选题】
She took it as an insult which wasn’t at all what I( ).
①
intend
②
intended
③
has intended
④
had intended
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【单选题】
37. 1000 guests were all found ____in the room which only ___800 people.
①
seat;seat
②
hold;hold
③
hold;seat
④
seated;hold
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【单选题】
Many people who had seen the film were afraid to go to the forest when they remembered the scenes ___ people were eaten by the tiger.
①
that
②
by which
③
which
④
in which
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【单选题】
Those gifts o rare books that were given t us were deeply _____.
①
appreciated
②
approved
③
appealed
④
applied
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【单选题】
The noise was so ____ that only those with excellent hearing were aware of it.
①
dim
②
soft
③
faint
④
gentle
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【单选题】
Were it not for the rainny weather, they______ all right.
①
would be
②
may be
③
would have been
④
were
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【单选题】
39. A survey was carried out on the death rate of those who were infected by SARS, ________were surprising.
①
asresults
②
whichresults
③
theresultsofit
④
theresultsofwhich
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【单选题】
We passed a pool in which ducks were_________.
①
climbing
②
jogging
③
hiking
④
swimming
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随机题目
【单选题】
工程上使用的金属绝大部分是。
①
单晶体
②
多晶体
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【多选题】
按模样特征分类()
①
整模造型
②
分模造型
③
挖砂造型
④
假箱造型
⑤
活块造型和刮板造型
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【单选题】
单相变压器磁路饱和时,主磁通<imgwidth="35"height="54"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD28530.png">和励磁电流<imgwidth="38"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD28643.png">的波形()
①
同时为正弦波
②
同为尖顶波
③
不会同时为正弦波
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【单选题】
变压器主磁通<imgwidth="50"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD18138.png">的主要特征是:
①
一个幅值恒定的旋转磁场
②
一个幅值变化的旋转磁场
③
一个幅值变化,位置不变的脉动磁场
④
必须在自定义函数后面
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【判断题】
若将变压器副边绕组向原边折算,则折算前后电流关系为<imgwidth="56"height="22"v:shapes="对象_x0020_22"src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image020.png">。
①
正确
②
错误
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【判断题】
额定电压为<imgwidth="72"height="18"v:shapes="对象_x0020_5"src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image002.png">的单相变压器,短路阻抗<imgwidth="130"height="24"v:shapes="对象_x0020_6"src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image004.png">,负载阻抗为<imgwidth="124"height="22"v:shapes="对象_x0020_7"src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image006.png">,从一次侧看进去总阻抗大小为<imgwidth="94"height="22"v:shapes="对象_x0020_8"src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image008.png">。
①
正确
②
错误
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【判断题】
采用电动机惯例的一台他励直流电动机<imgwidth="134"height="24"v:shapes="对象_x0020_20"src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image018.png">则电动机运行于倒拉反转状态。
①
正确
②
错误
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【判断题】
单相变压器原/副绕组的标志方式不仅与绕组的绕制方式有关,还与绕组的首端A(a)和尾端X(<imgwidth="14"height="14"v:shapes="对象_x0020_48"src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image046.png">)有关。
①
正确
②
错误
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【判断题】
由变压器一相电动势表达式<imgwidth="120"height="26"v:shapes="对象_x0020_30"src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image026.png">可知,<imgwidth="18"height="24"v:shapes="对象_x0020_31"src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image028.png">相量落后于<imgwidth="26"height="26"v:shapes="对象_x0020_32"src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image030.png">相量900
①
正确
②
错误
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【判断题】
降低电源电压调速的他励直流电动机带额定恒转矩负载稳态运行时,不论转矩高低,电枢电流<imgwidth="52"height="24"v:shapes="对象_x0020_26"src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image024.png">。
①
正确
②
错误
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